I’m afraid the envelopes must be delivered at once, （） the conference brochures won’t be mailed.
A. unless
B. in case
C. otherwise
D. yet
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用卡车能把蔬菜在2天内从某一农场运到新墨西哥的市场上，总费用是300美元。而用火车运蔬菜则需要4天，总费用是200美元。如果减少运输时间比减少运输费用对于蔬菜主人更重要的话，那么他会用卡车运蔬菜。 以下哪项是上述论证所必须假设的
A. 用火车运的蔬菜比用卡车运的蔬菜在出售时获利更多。
B. 除了速度和费用以外，用火车和卡车从农场运输蔬菜到新墨西哥之间没有什么差别。
C. 如果运费提高的话，用火车把蔬菜从农场运到新墨西哥的时间可以减少到2天。
D. 该地区的蔬菜主人更关心的是运输成本而不是把蔬菜运往市场花费的时间。
E. 用卡车运输蔬菜对该农业区的蔬菜主人而言每天至少值200美元。
When the statement was made, the plane （）.
A. was in the course of landing
B. had already landed
C. had just taken off
D. was in the middle of its flight
Do you think it would be better to send out sale（）directly to prospective buyers
A. book
B. literature
C. manual
D. price
Which of the statements about the teens is NOT true
A. They are ill-bred students in school.
B. Some of them take "real drugs".
C. Teens needs attention.
D. A few casually display scars on their arms.
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