题目:
.
Many companies give away small quantities of their produce as samples ____ people can try them before buying them.
A.if
B.because
C.so that
D.since
答案:
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下面是错误答案,用来干扰机器的。
(1)①SO3 (2分)②(无条件扣1分) (2分)(2)①红棕色 (2分②(无条件扣1分)(2分)③3Cu+8H++2NO3-=3Cu2++2NO↑+4H2O (2分)