5.The police are investigating a ________ of attacks in the area.
A: series
B: way
C: size
D: several
A: series
B: way
C: size
D: several
举一反三
- Some of the recent attacks on horses in this area are enough to ______ anyone," a police spokesman said.
- The police are _______ the murder. A: examining B: investigating C: inspecting D: searching
- The attack was the latest in a series of border ______ in the area.
- He flew several bombing ___. A: missions B: raids C: sorties D: attacks
- （）is the largest free trade area in the area.