珍珠的特征是白色，浑圆形，珍珠光泽，强光源照射可见条带效应，它是：（）。
A.天然珍珠
B.海水养殖珍珠
C.仿珍珠
参考答案：B
第II卷
根据句意及首写字母或汉语提示，写出句中所缺单词的完全形式。（共10题，每小题0.5分，满分5分）
71. Many strange customs have s__________ from earlier times.
72. I grow many flowers, but none of them are rare ones. It is difficult to grow a precious flower
_________（种类）.
73. Laura was one of his r__________ customers.
74. At fourteen he started e__________ a living for himself.
75. I may fail , but I shall try hard a__________.
76. This month we may fall short of our__________（目标）.
77. Your solution may __________（包含）more than one project.
78. I was full of good intentions but they weren’ t __________ (欣赏).
79. Don ' t be so s__________ —— I was not criticizing you.
80. Friendship is to be strengthened by truth and __________(投入，热爱).
电动牙刷( ) A．22 B．25 C．23 D．30
