问题
选择题
The singer and dancer ________ come to the party tonight.
A．is to
B．are to
C．are going to
D．was to
答案
答案：A
the singer and dancer指一个人所兼的两个称谓，因此谓语动词用单数。
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The singer and dancer ________ come to the party tonight.
A．is to
B．are to
C．are going to
D．was to
答案：A
the singer and dancer指一个人所兼的两个称谓，因此谓语动词用单数。
为标准状态下空气和烟气的密度；tk为室外空气温度；tpi为烟囱内烟气平均温度；b为当地大气压）