在Photoshop中使用圆形选取工具时，需配合______键才能绘制出正圆。
A. SHIFT
B. CTRL
C. TAB
D. Photoshop不能画正圆
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单个微机之间“病毒传染”媒介是______。
A. 键盘输入
B. 硬盘
C. 移动介质
D. 电磁波
Great changes______ place since he left here.
A. have been taken
B. have taken
C. were taken
溃疡性结肠炎所致腹泻特点是
A. 大便多呈糊状，混有黏液、脓血，里急后重常见
B. 大便多呈糊状，质稀薄，色鲜红，不伴里急后重感
C. 大便不成形，柏油样便
D. 米泔水样便，伴里急后重
E. 白陶土样便，不伴里急后重
Why didn't Mark and Dan go sailing together
A. Because Mark was in some other place.
Because Dan was in some other place.
C. Because Dan asked his brother to go with Mark.
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