颞骨横行骨折面瘫发生率约为（）。
A.20％
B.30％
C.40％
D.50％
E.60％
参考答案：D
Little wonder _____ up their hands in dismay.
A．have some thrown
B．some have thrown
C．thrown some have
D．have thrown some
某逻辑函数真值表如右，它的逻辑式应为（）。
A.F=A+B
B.F=B+C
C.
D.
