In the author's view, some languages "fall behind" western languages in the aspect of ______.
A. their sound pattern
B. their grammatical structures
C. their vocabularies
D. their speakers
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构成投资组合的证券A和证券B，其标准差分别为12%和 8%。在等比例投资的情况下，如果二种证券的相关系数为1，该组合的标准差为10%；如果两种证券的相关系数为-1，则该组合的标准差为2%。 ()
A. 正确
B. 错误
Which service is available on Thursdays？
A. Medical checkup.
B. License renewals.
C. Written tests.
D. Road testing.
What is advised for customers wanting road testing to do？
A. They should contact Mr. Dean Roberts.
B. They should visit the station first.
C. They should make appointments.
D. They should submit a request form.
What is NOT a stated responsibility of the job？
A. Supervising assistants.
B. Researching new initiatives.
C. Organizing discussion.
Developing strategic plans.
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