these two "and"s are not both in the list. the list begins with "cost less".
analogy: i went to the grocery store and bought food, got money from the ATM, and sampled dishes from the deli. this is fine, since the list (3 things that i did at the store) STARTS with "bought food". "went to the store" is not part of the list.
2)Compared with most sport utility vehicles, minivans cost less, get better gas mileage, allow passengers to get in and out more easily, and have a smoother ride.
第一个 and 套第二个,两个不是平行的。
Minivans carry as many as seven passengers and, compared with most sport utility vehicles, cost less, get better gas mileage, allow passengers to get in and out more easily, and have a smoother ride.
Minivans carry as many as seven passengers and, compared with most sport utility vehicles, cost less, get better gas mileage, allow passengers to get in and out more easily, and have a smoother ride.
my first complaint about (d) is that it's noticeably awkward, but you'd have to be a native speaker of english to pick up on that.
however, there's a problem of semantics (meaning) with (d). the modifier "...carrying..." seems to signify that the latter traits are only true of minivans when those minivans are actually carrying the requisite number of passengers. if they aren't, then all of a sudden those things aren't true anymore.
choice (a) correctly uses the conjunction "and", which implies that both things are true but don't necessarily have to do with each other (i.e., the # of passengers is independent of the other claims).