1,(Using) carbon-dating techniques , archaeologists can determine the age of many (ancient objects) by (measurement) the amount of radioactive carbon (they contain).
这里的using 做什么词性啊,
答案是measurement,错了,为什么啊???
2, The evoluntionary adaptation of a particular species of animal over time occurs in response to environmental conditions ,including others animals.
3,Saturn is the (second largest) planet (after ) Jupiter ,(with) a diameter nearly ten times (those) of Earth.
我选的是after,但是答案写着是those 错了,为什么啊?
4, In human beings the liver (is) the (biggest) glandular (organ) of (his )digestive system.
根据我的意思,我觉得是organ 错了,应该改为organism.
但是答案写着是his 错了,为什么啊???
5, (Ordinary) beaver dams (vary) in length from (a few feet) to a hundred feet or (more than).
我觉得a few feet ,错了,要用little feet.
但是答案是more than 错了,为什么啊
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