单项选择题

Why is the alarm sounded when the bridge rang telegraph?

A． The system is automatically set.
B． The asynchronous situations build.
C． The manual operation shows.
D． The building scheme shows.
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大多数萜类化合物都不具手性碳原子，不具有光学活性。
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In the United States, Veterans Day is a holiday established to honor Americans who had served in World War I. It falls on______.A.September 9thB.September 11thC.November 9 thD.November 11th
A.A.September
B.September
C.November
D.November
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