题目内容

She ought to make a shift now; she is in a bad mood because she ______ in the dull work too long.

A. had engaged
B. is engaging
C. has been engaging
D. engaged

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砌筑砂浆应随伴随用，一般应在2h之内用完，气温低于10℃时可延长至（）。

A. 1h
B. 2h
C. 3h
D. 4h

墙身砌筑的原则是（）。

A. 角砖要平，绷线要紧
B. 上灰要准、铺灰要活，上跟线、下跟棱
C. 皮数杆要立正立直
D. A+B+C

无符号二进制整数10000001转换成十进制整数的是

A. 119
B. 121
C. 127
D. 129

From the text we can learn that Mr. Starr is very ______ as a historian.

A. conservative
B. cunning and shrewd
C. objective and canny
D. critical and aggressive