问一道must be true的题.

72. Large national budget deficits do not cause large trade deficits. If they did, countries with the largest budget deficits would also have the largest trade deficits. In fact, when deficit figures are adjusted so that different countries are reliably comparable to each other, there is no such correlation.

If the statements above are all true, which of the following can properly be inferred on the basis of them?

(A) Countries with large national budget deficits tend to restrict foreign trade.

(B) Reliable comparisons of the deficit figures of one country with those of another are impossible.

(C) Reducing a country’s national budget deficit will not necessarily result in a lowering of any trade deficit that country may have.

(D) When countries are ordered from largest to smallest in terms of population, the smallest countries generally have the smallest budget and trade deficits.
            C

(E) Countries with the largest trade deficits never have similarly large national budget deficits.
            

The passage asserts that large budgets deficits do not cause large trade deficits. If this is so, it is possible that a country with large budget and trade deficits could reduce its budget deficit and yet retain a large trade deficit.Thus, choice C is the best answer.

None of the other choices can be inferred. The passage says nothing about how countries respond to large budget deficits (choice A). The passage states that comparing deficit figures for different countries can be reliable (contrary to choice B). Correlation between deficit size and population size (choice D) is not at issue inthe passage. Finally, it is  consistent with the passage that countries with the largest trade deficits sometimes

have similarly large budget deficits (choice E).

175. Parasitic wasps lay their eggs directly into the eggs of various host insects in exactly the right numbers for any suitable size of host egg. If they laid too many eggs in a host egg, the developing wasp larvae would compete with each other to the death for nutrients and space. If too few eggs were laid, portions of the host egg would decay, killing the wasp larvae.

Which of the following conclusions can properly be drawn from the information above?

(A) The size of the smallest host egg that a wasp could theoretically parasitize can be determined from the wasp’s egg-laying behavior.

(B) Host insects lack any effective defenses against the form of predation practiced by parasitic wasps.

(C) Parasitic wasps learn from experience how many eggs to lay into the eggs of different host species.

(D) Failure to lay enough eggs would lead to the death of the developing wasp larvae more quickly than would laying too many eggs.
            A

(E) Parasitic wasps use visual clues to calculate the size of a host egg.

175.

Comparing two host eggs in which parasitic wasps have laid different numbers of eggs, it is theoretically possible laid different numbers of eggs, it is theoretically possible to determine what size of host egg would be required for a single wasp egg. This would be the smallest egg the wasp could parasitized, so A is the best answer.None of the other choices follows from the information given. Host insects could conceal their eggs from the wasps (choice B)., and the wasps could have inborn abilities to lay appropriate numbers o eggs (choice C). Laying too many eggs could lead to the death of the larvae faster than laying too few (choice D), and the wasps could use tactile clues to calculate the size of a host egg (choice E).

Comparing two host eggs in which parasitic wasps have laid different numbers of eggs, it is theoretically possible laid different numbers of eggs, it is theoretically possible to determine what size of host egg would be required for a single wasp egg. This would be the smallest egg the wasp could parasitized, so A is the best answer. None of the other choices follows from the information given. Host insects could conceal their eggs from the wasps (choice B)., and the wasps could have inborn abilities to lay appropriate numbers o eggs (choice C). Laying too many eggs could lead to the death of the larvae faster than laying too few (choice D), and the wasps could use tactile clues to calculate the size of a host egg (choice E).

这道题也不懂

72 E never太绝对了，经验告诉我，选项里面有太绝对的词的，很少正确，再说了，提干都说了，两者之间没有必要的相关性，E肯定不对了

175我当时作的时候也错了，后来一想，是自己太主观了，

(A) The size of the smallest host egg that a wasp could theoretically parasitize can be determined from the wasp’s egg-laying behavior. 题干说wasp可以判断下多少蛋正合适，所以啊，smllest size能确定的，bigest size也能确定

(B) Host insects lack any effective defenses against the form of predation practiced by parasitic wasps. 无关

(C) Parasitic wasps learn from experience how many eggs to lay into the eggs of different host species. 文中没说
    

experience，我当时却主观臆断了，做逻辑题阿，一定不能主观，文中没说的，不能瞎推测

(D) Failure to lay enough eggs would lead to the death of the developing wasp larvae more quickly than would laying too many eggs. 文中也没比较阿
            

(E) Parasitic wasps use visual clues to calculate the size of a host egg.文中也没说用visual clues，如果这个能对，B也能对了